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Thank you

update of Lyx AND MiKTeX solved the problem!

Hello,

I have a simple TIKZ-Code in Lyx:

\begin{tikzpicture}
\draw[red] (0,0) -- (1,1);
\draw[red] (1,0) -- (0,1);
\draw[blue] (0,0) rectangle (1,1);
\end{tikzpicture}

The output in pdf works perfectly.
However, the instant preview in Lyx does not work. Choosing "Insert-Preview" creates only ...